"It would be possible in the distant future that the world is over polluted with toxic/radioactive contamination and it's rare to see green plants. People living under surface... And there are guys who go on search missions looking for living plants. And when they finally do find them, they will protect it the plants with their lives.
Its not gonna happen, I know. I can dream.
There's been a lot of talk about building new nuclear stations, so thats where the idea came from."